The tide with the greatest range between high and low water, occurring approximately every two weeks when the sun, moon, and earth are aligned during new and full moon phases. Spring tides produce the highest high tides and lowest low tides.
Category: Weather & Sea Conditions
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HurricaneA mature tropical cyclone that develops in the North Atlantic or eastern North Pacific Ocean, characterised by sustained wind speeds of 64 knots or greater.MonsoonA seasonal prevailing wind in the Indian Ocean and southern Asia that brings heavy rainfall during summer months.Sea StateA description of the condition of the sea surface with respect to wave and swell characteristics, categorised using the Douglas Sea Scale from 0 (calm, glassy) to 9 (phenomenal, waves over 14 metres).Storm SurgeAn abnormal rise in sea level generated by a storm's winds and low atmospheric pressure, over and above the predicted astronomical tide.SwellLong-period ocean waves generated by distant weather systems that travel far from their origin, distinct from wind waves generated by local conditions.Trade WindsPersistent easterly winds that blow from the subtropical high-pressure belts toward the equatorial low-pressure belt, from the northeast in the Northern Hemisphere and the southeast in the Southern Hemisphere.
Back to DictionaryEntry updated May 2026